Chelsea have made a huge mistake in signing Costa and letting Lukaku go

Romelu Lukaku

Chelsea could be a lot worse off in the attacking department after allowing Romelu Lukaku to leave despite signing Diego Costa from Atletico Madrid.

Chelsea parted company with Romelu Lukaku yesterday as he joined Everton for a club-record fee of £28 million. It is a surprise to see him leave after joining the club from Anderlecht three years ago with the hope he could become one of the best in the world.

However he was rarely given an opportunity but two successful loan spells at West Bromwcih Albion and Everton allowed him to show everyone what he can do. Everton now have themselves a 21-year-old striker still with plenty of potential, a proven Premier League pedigree and he will easily settle back in at Goodison Park allowing him to hit the ground running.

Chelsea are now left with Diego Costa, Fernando Torres and Didier Drogba as their striker choices with Patrick Bamford looking as if he will head out on loan again, with Middlesbrough keen. Drogba is unlikely to be starting many games, and Torres has become unreliable with regards to goals in the top flight so a lot of faith will be put in Costa.

Costa has never played in the Premier League and no doubt it will take him a while to adjust to the game. The 25-year-old has only ever really had one prolific season in his career with the 2013-2014 season yielding 27 goals in La Liga. His previous two seasons saw him net 10 goals in each and he arrives with a hefty price tag of £32 million with that in mind.

He had a very poor World Cup with Spain as he was played in a lone striker role, one which he is likely to occupy for Chelsea, and the club could again be struggling for goals this season, an area that let them down last time round. Luckily they have plenty of goals in their midfield but they are going to be heavily reliant on Costa.

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Lukaku however has shown in the last two season how important he can be for a team, instantly having an impact at both West Brom and Everton where he scored 17 and 15 goals respectively. £28 million seems a lot for Everton to spend but when you consider that's what they received for Marouane Fellaini last season then it represents a good deal. They could potentially have him for the next decade and even if they do sell him before then they will probably make a profit on their deal.

Expect Romelu Lukaku to find the net more times than Diego Costa in the Premier League this season.

Who will score more this season, Lukaku or Costa?

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